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During update to Monterey beta to an external ssd, startup stopped with barred circle and unusable ssd! I have a recent time machine backup, still I don't know how to repair the respective container. In diskutil the volume is shown as "AppleAPFSMedia not initialized" and can not be repaired! 'diskutil apfs list' shows an error (Container ERROR -69808).  See partial listing: APFS Containers (3 found) | . . . | +-- Container ERROR -69808 ====================== APFS Container Reference: disk8 Size (Capacity Ceiling): ERROR -69620 Capacity In Use By Volumes: ERROR -69620 Capacity Not Allocated: ERROR -69620 | +-< Physical Store disk3s2 1C0E6E67-8751-4376-8C2E-9DAA6460C864 | ----------------------------------------------------------- | APFS Physical Store Disk: disk3s2 | Size: 599995129856 B (600.0 GB) | +-> No Volumes